Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 431 AM EDT Thu Apr 28 2016 Valid 12Z Thu Apr 28 2016 - 12Z Sat Apr 30 2016 ...There is a slight risk of severe thunderstorms over parts of the Southern Plains and over parts of the Southern Mid-Atlantic... ...Heavy rain possible over parts of the Southern Plains/Lower Mississippi Valley and parts of the Central Plains... ...Snow over parts of the Central Rockies... A strong storm over the Middle Mississippi Valley will slowly weaken and move southeastward to the Carolinas by Friday evening. Showers and thunderstorms will develop along and ahead of the front from the Ohio Valley to parts of the Central/Eastern Gulf Coast that will move eastward to parts of the Mid-Atlantic/Southeast and the Central/Eastern Gulf Coast by Thursday afternoon. The showers and thunderstorms will move off the East Coast by early Friday morning. Rain will also develop over parts of the Northern High Plains eastward to parts of the Middle Mississippi Valley/Upper Great Lakes that will move eastward to parts of the Northeast while extending westward to parts of the Upper Mississippi Valley by Thursday evening. The rain will extend from parts of the Mid-Atlantic to parts of the Great Lakes on Friday morning that will be confined to parts of the Northern Mid-Atlantic by Friday evening. A second storm over the Great Basin/Southwest will move eastward to Texas by Friday evening. The system will produce rain and higher elevation snow over parts of the Great Basin/Central Rockies and parts of Central/Southern California eastward to parts of the Southern Rockies on Thursday morning. The rain and higher elevation snow will expand into parts of the Northern Intermountain Region to parts of the Northern High Plains by Thursday evening. By Friday morning, the rain and higher elevation snow will be confined to parts of the Northern Intermountain Region to parts of the Great Basin and the Central/Southern Rockies. On Friday afternoon into evening, showers and thunderstorms will develop over parts of the Southern High Plains southeastward to parts of the Western Gulf Coast. The showers and thunderstorms will expand into parts of the Central High/Central Plains and into parts of the Lower Mississippi Valley overnight Thursday into Friday morning. By Friday evening the showers and thunderstorms will expand into parts of the Middle Mississippi Valley/Tennessee Valley. In addition by Friday morning, a third system will move onshore over Pacific Northwest moving to parts of the Great Basin/Central California by Friday evening. Rain will begin over parts of the Pacific Northwest on Friday morning that will extend from the Northwest to parts of the Rockies and the Southwest by Friday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php